| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at the time when | 45 |
|
| 2 | at the time when [noun] | 41 |
|
| 3 | [verb] at the time [noun] | 16 |
|
| 4 | [verb] the time when [noun] | 11 |
|
